Grinding mill



w. N. HARTSHORN GRINDING MILL Aug. 21, 1923. 1,465,713

Filed Dec. 26 1919 3 Sheets- Sheet 1 Aug. 21, 1923.

W. N. HARTSHORN GRINDING MILL Filed Dec. 26 1919 a Sheets-Sheet 2 Aug. 21, 1923.

W. N. HARTSHORN- GRINDING MILL 3 Sheets-Sheet 5 Filed Dec. 26

Patented Ad 21, 1923.

um'rso STATES mi QEFECE;

WrLLIs n, nanrsnonn, or RACINE, WISCONSIN.

GRINDING MILL.

Application filed December 26, 1919; Serial no} 347,371.

To aZZ whomz't may co'cwern:

Be it known that I, WILLrs N. HAR'rsHonN,

a citizen of the United States, and resident; of Racine, in the county of Racine and State of Wisconsin, have invented new and useful Improvements in Grinding Mills, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The present invent1on relates'to certain new and useful improvements 1n grmdmg mills and more particularly to mills of thatvide a grinding mill including several units arranged one above the'other which are so constructed that any one or more of the units may be readily removed from the-mill without disturbing'the othernnits or any portion of the driving mechanism of the mill. The grinding mills now in general use are so constructed that when it is desired to aresurface the faces of the stones of the various units it is necessary that the same be done at the mill proper which is very undesirable in that particles of stone, dirt and the like contaminate the products in adjacent machines; Hence, with the above and other objections in mind my invention fhas for another of vits objects to provide a' grinding mill so constructed that the grinding units thereof may be readily removed and taken bodily as a unit to a properly equipped room for dressing or refinishing the grinding-sur- .faces of the stone in ,the'most efiic'ient manner.

A still further object of this invention is to provide avmill of the class described in-.

cluding a" plurality of readily removable grinding units which aresoco-nstructed that the units may be readilyindependently adjusted. A- still -further object of my inven- 7 tion is to rovide 'a-novelform of feedoontrol which may be readily adjusted to vary the amount of material supplied to the grind ing units or -which may be operated to completely shut ed the supply-of material with- I out the necessity of shutting down the mill so that the mill may be run sufiiciently long after the supply of material therein has been terial which'may be therein. a

- Withthe above and other objects in view which will appear as the description proceeds my invention resides in the novel con struction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by theappended claims, it being understood that such changes in the precise embodiment f th ia herein disclosed invention maybe made as comewithinthe-scopeof the claims.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have,

so; far devised .for the practical application of the principles thereof, and in which:

Figure 1' is aiside'view of a complete grinding mill embodying my invention; parts being broken away and in section to more clearly illustrate the various details of construction. y Y

' Figure 2 is an'elevational view lookingat the rear of the mill.

Figure? 3 is a side plan view of a lower portion o-fmy machine illustrating: one of the units as beingremo-vedtherefrom and indicating the equipment I employ to remove thesame from themachine.

Figure 14: is a'fragmentary sectional view taken through the grinding unit adjusting member. 1 i

Figure?) is a fragmentary sectional view taken on the plan indicated on the line 5-5 7 cut oif to insure the discharge of the maof Figure 1 through-the said control mechanism. I

Referring now more particularlyv to the accompanylng drawings my lnventlon may be said to-broadly consist of a mainimachine 10 0 frame having a plurality of independent grinding units-removably mounted therein,

driving mechanism'for operating the grinding units andsoarranged as to permit thereeffecting the operation of the remaining units, means for; readily independently adjusting the grinding units, readily, variable "'means for feeding material to the first grindunit and means forconveymg the ma- 110 zmoval of anyof the grinding units without- V terial discharged from one grinding unit to the nextunit.

The machine frame consists ofa base section 10, vertical side standards 11 a top transverse section 12 connecting the upper ends of standards 11, and rear transverse brace members 13 connecting the standards 11 as best shown in Figure 2. This arrangement provides a frame structure which is firmly secured against vibration and is so constructed as to permit the ready access to the various machine parts; v

Secured tothe inner faces of the standards 11 in spaced relation arebraclret members 14 forming supportst'or the grinding units, and as the .several grinding units are substantially alike the description ofonewill sufiice tor -all. The grindinguni-t comprises a main casing 15 provided with apair of 0p- 'centra-lbore 22in which is j ournalled a spindle 23 having one'end'projected below the ca'sing15 and engaged-with athrust bearing 24 and its upper endjsupporting arevolvably imounted stone 25 for co-operating'withthe stationary stone :18. Theustone 25 is'cemented or otherwise secured inacasing'or housing 26 and is centrally bored and has a retaining spider member. 27 secured therein landiprovided with akey slot 28 for receiving a driving'key 29 'seeured'to the'upper end of r the spindle 23. The members 27 of the uppermostigrinding unitv has ia-collar or sleevev 30 entering therein for adjustable connection with :the material feed control mechanism to.:be' late-r described, and the members 27 of the other units are provided with a funnelshaped opening31' into which the discharge ends of the material conveying members extend, as will be later described.

. The stone 18 is rigid with the fixed casing 15 and thestone '25-is rigid with its casing 26 which is rotated with the spindle 23by meansof the "key29 between said spindle and spider '27 which is fixed to the casing '26. The means for rotatingrthe spindle 23 and consequently the stone'25consists of a large spur gear 32 splined to the portion ofithe spindle '23 projecting below the casing 15 and disposed above the thrust bearing 25,

which spur gear is meshed with;a smaller {spur gear 23 fixed to a; vertical driving shaft 34 j ournalled "in bearings 35 centrally formed 'inthe'braces 13 and base 10. The

shaft 34 has a bevel gear 36 splined thereon gear 37 splined to a shaft 38 journalled in the upper ends of supports 39 secured to the base 10 and one of the standards 11 and adapted to be drivingly connected with a drive pulley 40 by suitable clutch mechanism 41. The pulley 40 is connected with anydesiredsourceor power (not shown) in any desired manner and the bevel gears 36 near its lower end and meshed with a bevel and 37 are normallyienclosed by a protects ing housing or guard 42.

The spur gear '32 isienclosed by a housing 43 firmly secured to the housing 15 and vforming a substantial part thereof, the spur gear 33 meshing with gear32 through an openmg=44 lll'tlle casing .43, and said gear "33 being enclosed. by-a guard 45 secured to' the casing'43 as at :46.

From this description it will be readilyseen that the shaft 34 :is rotated through means of its connection withthe. drive pulley '40 andthe stone 25 .is revolved by means of 1 its connection with the-shaft 40-through the gears 33 and32, spindle 23 :and key c'onnections 29.

This arrangement of driving mechanism permits the ready removal of any of the units without effecting the drive of the remaining units as the connection betwee-n the spur gears 32 and 33'o'f theremaining units is not disturbed in-any 'manner. VVhenjit is desired to remove any onecfthe unitsit is simply necessary :to disconnect thesecuring means 46 betweenzthe guard l5 and the cas-,

ing 43 so that whenthe unit isremovedthe gears 32iand33 may be readily-disengaged. As best shown in -T igure 1 the large 1 spur gear ,32 has its tace =-of less width than the face off-the small'gar 33 to permit the verti-1 cal movement of *the spur gear '32 of the grinding units with the rev'olvable stone 25 1 when moved to 'its various positions of adjustrnent by means new about to be described.

The thrust bearing-24' has its-upper portion exteriorly threaded as at 47 and in threaded engagement with a -cap' or housing 48 centrally secured in=the bottom o'ffthe casing 43 and has itslower portion provided with gear teeth 49 in mesh with a worm gear 50 secured to the end of a shaft Sl -journalled'in bearings =52 and having a-hand wheel 53 secured toits' outer end.

To adjust the distance between the grinding surfacesor faces of the stones 25 and 18, thethrust bearing'24 is adjusted by means of the hand wheel 53 which adjusts the same with respect to the cap 48 to raise or lower the stone 25. A1sleeve'member 5'4 is --secured to the' spindle 23 to 'pro'teet the hearing-22 in bore 22; The Y faces of "the gears 32 "being of 'difi'erent widths permits the ready- 11lovement ofthe -largeispur gear withthe spindle 23 to various adjusted positions as will-he apparent without disturbing its driving connecton with the small spur gear 33.

The substance to be ground is fed to the uppermost or first grinding un t'of the machine from a hopper 55 secured to the top .frame section 12 and having its discharged end disposed in align with the collar or sleeve 30 slidably and rotatably mounted within the member 27, by meansof a sleeve 56 carried by the feed control mechanism and telescoping within the sleeve 30 so that the stone may be readily adjusted without disconnecting the sleeve and the member 27. Disposed between the hopper and the sleeve 56 is a cylindrical member 57 having one end solid and its other end pro vided with spaced lon 'itudinall extendin L C) b reccsses58, and said member is adapted to be rotated so that when the recesses 58 are alignedvwith the discharge end of the hopper 55 and the sleeve 56 the material will be discharged from the hopper by said recesses.

The member 57 is freely journalled upon a shaft 59 journallcd in bearings 60 formed on support brackets carriedby the frame section 12 and is movable'along the shaft- 59 to align either'its recessed portion or its solid portion with the discharge endvof the hopper or else to partly align the recessed portion and the solid portion of said member with the dischargeend of the hopper to control the feed of material from the hopper. The means for moving the member'57 along the shaft 59 consists of a screw shaft 61 having its inner end rotatably secured to the frame and having its portion in threaded engagement with spaced ears 62 of a bracket member 63 having a yoke 6 iengaged in an annular groove 55 of the member 57 so that the movement of the bracket 63 toward or away from theframe will effect a corresponding movement oft-he member 57-. j

The bracket 63 is moved by means'of a hand crank 66 secured tothe outer end of the screw shaft 61 and adapted to be rotated in either direction corresponding tothe desired movement of the member 57 as will be By this construction it is possible to con trol the feed of material from the hopper and to disconnect the member 57 from the drive shaft 59 irrespective of its position on said shaft without effecting the drive conveyors (not shown) V v outer of the grinding units so that the same may continue to operate until; the material between the stones-of the 'various unitsjhas been'expelled therefrom. The shaft 59 is rotatedby meansof a drive pulley 70 having a belt'connection 71' with the vertical drive sh aft 3 lras best shown inFigures 1 and 2.

The material after it has entered the first.

grinding unit andireduced between the stones thereof is discharged intothe trough 21 and then outwardly from the trough 21 through a discharge spout 72 into the receiving end of a screw con'veyor73 readily reniovably disposed within brackets 7 i securedto the underside of the casing 43 and having 7 its discharge end 75 positioned within the mouth31 of the spider member of the next grinding unit. After the material has been further reduced by'the neXt grinding unit it again passes into' thev trough 21 thereof through spout 72 and is conveyed tothe next grinding unit by means, eof 'asimilar conveyor 73 and then it is discharged from the last grindin unit through a spout 76 to be discharged to suitable containers or The conveyors 73' are readily removabl secured in thebrackets 74 as it is necessary to remove thesame before the unit carrying the same is removed from the machine.

frame. The conveyors are-drivenbysuitable belt connections 77 connecting the drive pulleys 78 of the conveyors withvdrive pul leys 7 9 fixed to the end of shaft 59 remotefrom its drive pulley 70. Y

As is common-in the art, the stationary stone 18 may be heated by means of heating coils 8O connected'by means of inlet and discharge pipes 81 and 82 respectively with a supply pipe 83 and a discharge pipe-84.

In Figure '3 I have illustrated the im proved structure I employ for handling the several units of the mill and transporting the same from the mill' to a room where the same maybe worked upon in the most efficient manner. -Thisstru'cture consists of a pair of horizontal parallel frames; or tracks 85 having their inner ends secured; to the i V standardsll at a pointadjacent thebrackets 14 andhavi'ng their outer ends supported upon vertical standards 86. VJ hen it is desired to move a: grinding unit, the tracks 85' are secured in'position and'the bolts 17 se curing the unit to the brackets '14: are removed and suitable means provided for drawing the unit upon the tracks 85. i The means for driving the'un-it ,uponthe track 85 consists of-a toothed rack'87 adapt ed to have its inner endfsecured as at 88 to the bracket 16 of the unit andihaving its outer end in mesh with a toothed gear 89 91 fixed on the outer end of the track 85. An

operating handle 92 is fixed to the shaft 90 fixed to, a shaft 90 journalledin a bearing all units,

so that the shaft 90 and its gear 89,.may be rotated to move the rack 8 away from the mill frame and with lt'the grlnding unit.

As depicted in Figure 3, the intermediate unit is shown as being mounted upon the track 85 and the revoluble stone as suspended bymeans of a lifting cable 9.3 connected with the stone by a yoke member 94. r r

V The supports 86am of various heights so that the track'85 may be secured to the standards 11 in line with the bracket 14 of the unit which it is desired to remove. lVhat I claim as m 1 invention is: 1. A grinding mill, comprising a plurality of superimposed grinding units, each unit including a pair of cooperating-grinding members, adrive spindle for one grinding member of eaeh unit, a drive gear mounted on each spindle, a drive shaft connnon to a drive pinion secured on said shalt adjacent each drive gearand meshed therewith, and means engageahle with the drive spindles for adjusting the grinding members of the units, the drive ninio'ns being of greater'wic'lth than the drive whereby adjustment of the spindles will not disturb the connections between the units and the drive shaft. 2. A grinding mill, comprising a ing frame, a plurality of grincing 'mounted in the frame in superiin' osec. re tion with their axes in alineinent, a drive shat-' journaled in the frame and "common to said units, independent connee'tions between said shaft and each unit, means for conveying materialspassed through one unit to the next uni andqme'ans wherehyany or": said units maybe removed horir-zontally hen the frame without disturbing the drive and operation of the remaining units.

8. In a grinding mill, meansfor supply i ng materials to be ground to the mill, comprising a supply hopper having a depending discharge spout. a cylind ical member rotat ably mounted at the discharge end of said hopper spent and having one end solid and one end recessed, means for rotating said member, and means for sliding said memoer lengthwise to alin'e either end of said memher with the discharging spout of said hopper, said solid end, when in alinement with the discha spout,*shntting off the supply of materials from said hopper, ano said recessed end, when in alinementwith said discharge spout, permitting the materials from said hopper to be fed from the grinding mill. i L V 7 4. In a grinding mill, means for supplying materials to be' round to said mill, comprising a supply hopper, a revolubly mount ed Cylindrical member disposed at the discharge end of said hopper having a. solid portion and a recessed portion, drive means for rotating said member, means for aligning either part of said member with the diseharge end of said hopper, and clutch means carried by said" member in its various positions for connecting and disconnecting the same with the drive means.

5. A. grinding mill comprising a frame, a plurality of grinding units removably secured in the frame in superimposed axially alined relation and each consisting of a casing, a staionary stone'mounted in the ca s ing, a spindle journalled in the casing, a revoluble stone co-operating with the stationary stone and drivingly Connected with the spindle, and means for rotating the spindle.

5. A grinding mill comprising a mill frame, a grinding unit secured in said frame including a stationary stone, a revoluble stone co-ac'ting with-the stationary stone, and means for adjusting the spaced relation between said stones, and means for operatively driving said grinding units, said means including a rotatably and vertically adjustably mounted spindle having its up per'end connected With'the revo'luble stone, an a-d ustable thrust bearing engaging the lower end of said spindle, a spur gear drive shaft jouri'i'aled inthe frame, and

drive conneotionsbetwe'en the units and the drive shaft, said un ts being capable of ready independent removal without disturbing, the drive of the other units.

In testimony whereof, I my signature. e

WILLIS N. HART-SHORN. 

